$1\mathrm{.}1)$ When launching the program, it should first read any existing $($saved$)$ contacts from a CSV file named contacts.csv$,$ and display a user notification message when done

$1\mathrm{.}2)$ The program must properly execute five user commands: list, view, add, del, and exit. Tip: the test script should be used for code validation during development.

$1\mathrm{.}3)$ The command menu shown below with the program$$s available user commands should be displayed immediately upon program launch and after displaying the results of each processed command.

$1\mathrm{.}4)$ When adding and deleting contacts, the changes should be immediately saved to the contacts.csv file. That way, no changes are lost, even if the program crashes later.

$$

Test Script for Part $1$:

Program launch

Contacts file loaded.

$$COMMAND MENU

list $$ Display all contacts

view $$ View a contact

add $$ Add a contact

del $$ Delete a contact

exit $$ Exit program

Command: list

$1.$ Guido van Rossum

$2.$ Eric Idle

Command: view

Number: $2$

Name: Eric Idle

Email: eric@ericidle.com

Phone: $+442079460958$

Command: add

Name: Mike Murach

Email: mike@murach.com

Phone: $559-123-4567$

Mike Murach was added

Command: list

$1.$ Guido van Rossum

$2.$ Eric Idle

$3.$ Mike Murach

Command: view

Number: $3$

Name: Mike Murach

Email: mike@murach.com

Phone: $559-123-4567$

Command: del

Number: $1$

Guido von Rossum was deleted

Command: list

$1.$ Eric Idle

$2.$ Mike Murach

Command: exit

Bye!